Improvement in sewing-machines



4811eets-Sh9et1.

a. Memos-KEY.

SEWING -MACHIN-E Patented Nov. 21, 1876.

' 4 Sheet s -sheet z. J. McCLOS-KEY. SEWING-MACHINE;

Nu l-M 6 14". Patent ed' Nov. 21, 1876,

J. McCLOSKEY.

v SEWING-MACHINE.

No.184,64.-4, Patented. Nov. 21,1876.

ray 4- 4 Sheets-Sheet UNITED STATES PATENT OFFICE.

JoHn MOCLOSKEY, or new YORK, iv. Y.

IMPROVEMENT .lN SEWING-MACHINES.

Specification forming part of Letters Patent No. [84,644, dated November 21, 1876; application filed December 13, 1875.

To all whom it may concern:

Be it known that I, JOHN MCOL0sKEY,'of

I the city, county, and State of New York, have invented certain Improvements in Sewing- Machines, of which the following is a specification: I V

This invention comprises a novel combination of parts whereby, in, a sewing-machine, is secured a pause or cessation in the motion of the needle at the end of its downward stroke, in order to insure full time for the passage of the shuttle through the needle-loop.

-The invention further comprises a novel combination of a circularv raceway, a rotary shuttle arranged to travel therein, and provided with steadyin g-sprin gs, and a radial arm on the operatingshaft,whereby a steady movement of the shuttle in accord with the movement of the needle is secured.

The invention further comprises a novel combination of leaf-springs, curved or bowed in their longitudinal direction, with the shuttie and the aforesaid raceway, whereby the smooth and frictionless operation of the springs in steadying the shuttle during its motion is provided for.

The invention further comprises a novel construction of the said shuttle and its inclosed bobbin, whereby easy access to the bobbin is provided for, and whereby a proper tension to the shuttle-thread and its facile delivery are secured. i

Figure 1 is a side view and partial section of a sewing-machine embracing my improve-- ments. Figs. 2, 3, 4, and 5 are detail views of portions of the same. Figs. 6 and 7 are front views and partial sections of the same; and Fig. 8 shows a central longitudinal section of the shuttle forming part of my said invention.

A A are the two parts or sections of the primary shaft of the machine, each being supported in suitable bearings; but these two parts, instead of being in line, are placed eccentric with each otherthat is to say, with axes in parallel lines, but not longitudinally coincident. Upon the inner end of each is a disk, A, provided with a crank-pin, a. One of these crank-pins a takes into one end of a link, B, placed between the disks A, while the other of said crank-pins takes into-the opposite end of said link. By this means the rotarymotion of the one part or section of the shaft A may be transmitted to the other,

but the driven part will'move with a speed I varying at different parts of its revolution, according to the degree 'of eccentricity at which the two parts of the shaft are set.

C is a guide or race way, which may be of circular, oval, or other suitable form, and provided at the front of the machine, and in appropriate relation to the needle I). In this raceway is placed the traveling shuttle D. Upon the front end of the compound primary shaft A, just hereinbefore described, is a radial arm, B, which projects to and behind the shuttle D, in such manner that in the rotation of the shaft Athe arm B will drive the shuttle around in the raceway O withapositive motion. The shaft A being driven from its rear end, its forward portion will have, at different portions of its revolution, a

varying speed, which will, of course, be transmitted tothe shuttle driven thereby, this varying speed of the shuttle at different portions of its revolution adapting it to work in perfect unison with the needle in the proper formation of the stitch.

The power is applied to the shaft A by any usual or suitable means. Upon the rear extremity which extends a rod, D, the upper-end of which is pivoted to a rocking arm, E, arranged at any desired height above the needle-actuating shaft F, hereinafter described. Upon the rear end of this needle-shaft is a crank,

c. A link, F, has one end pivoted on this crank c, and its other end pivoted to the adjacent central portion of the rod D, as indicated at a.

The rotation of the crank 0 gives a com-.

pound lateral and vertical movement to the rod D, and this latter, acting through the link F, gives a rotary motion to the crank c, and consequently to the needle-shaft F; but

inasmuch as the movement of the rod D (at a certain point in the revolution of the crank 0) brings the link F into a position nearly or quite vertical, and causes the same to turn upon the crank c as upon a dead-point, as

shown approximately in Fig. 2, it follows that a temporary cessation of motion of the crank of said shaft is a crank, G, from c, and consequentlyof the needle-shaft F, is afl'orded. This cessation is designed to occur at that point in the revolution of the needleshaft at which the needle is depressed, to permit the passage of the shuttle througli'tli'e I needle-loop, and thereby greatly facilitate this portionof the operation of forming the'stitch. J

in a socket or hearing provided in the end of" a slide, f, that passes through a transverse slot in the adjacent end of the part 0*. As the part 0* rotates eccentric to the axis of the crank-pin e of the part 6* the slide moves in and out through the slot in the part 0*, the part b rotating the part 0*, with a speed varying at different parts of the revolution of the latter as the crank-pin e approaches or recedes from the axis of the part 2*, this variation in the speed of the part 0* of the needle-shaft being designed to afford a means of giving the crank G, on the front end of said shaft, the movement most advantageous in the operation of the needle-bar J. The crank G carries a link, G, the upper end of which is pivotedby a pivot,n, to the lower end of a second link, I, the upper extremity of which is pivoted to the needle-bar J, which latter is arranged to move vertically in the usual guides. I is a rod, which is pivoted at its outer end f. to a fixed support, and which has at its innerend a pin, g, whichplays in a semicircular slot, m, in the enlarged upper-portion of i the link I. The inner end of the rod 1 may, when preferred, be connected direct to the joint of the links I G, as represented in Fig. 5 at f. This rod 1 serves tokeep the pivot of the links G and I in such position as to insure the proper action of said links in giv ing motion to the needle-bar. The rotation of the crank G causes the link G to act as a pitmanto give the vertical rectilinear move ment to the needle-bar. The latter is lifted to itsutmost when the link is in such position that in moving upon the pivot n the said link turns upon a dead-point, so that, for some little distance, its swing together with the'further rotation of the crank G, does notappreciably move the needle-bar. The crank G is. also provided with a rod, n, the outer end of which is pivoted to an nprightlever, K. V The thread passes from the usual spool Lthrough eyes h h h around a reel, L; thence through a-fixed eye, h, to and through an orifice-0r eye, i, in the upper extremity of the lever K,

and then down to the needle in the ordinary manner. In lieu of the reel L and eyes h h any other suitable thread-conducting. device may be used.

The shuttle D is shown in section in Fig. 8. It is made hollow with its rear end closed by a screw-plug, 1', upon the inner side of which is a tubular stem, 0', which forms the axle of the bobbin S within the shuttle. a Upon, the

Upon the.

inner extremity of the stem 0" is aspur, which. are eyes or holes r. The sh little-thread is passed'from the bobbin to and fro through these eyes 'r to insure the requisite drag upon th'euireau, and thence through the tubular stem 1" out at the rear of the shuttle.

or slamming while revolving in the circular raceway, it is provided with longitudinal springs it, which, curving outward from its sides, bear against the adjacent surface of the raceway, and give stability and steadiness to the shuttle inits moti0n=aibresaid ltwillfof course,'be understood that the shuttle is retained in the raceway by an appropriate plate or front attached to the latter, ,as shown at F in Fig. 1. I

ne i i .Gis1the feed,oomprising an upright feedbar, the upper extremity of which, underneath the presser-foot I,isserrated to present the usual roughened surfaceingtcontact with the fabric in the use and operation of the machine. This feed G is connected at its lower end to the extremity of a horizontal link, J, the outer end of which is pivoted to a fixed sup The inner end of the link J, by

is capable of vertical adjustment in a slot, 1', in the aforesaid lower port, 9*. A means of a suitable pin,

extremity of the feed, so'that it may be adj usted higher or lower in the said slot to regulate the throw of the feed, as occasion may 9 require. The feed G has aicircular orifice or seat formed at ornear the center, and in this i is fitted aneccentric, R, provided upon the; shaft A, as represented in Fig. 6. The rotaa tion or said shaft causes the eccentric R to give a compound vertical and horizontal swinging motion to the feed, that, acting upon 1 the under surface of the fabricpassingbe neath theipresser-foot 1,feedsthe fabricto the needle in appropriate accord with the movements of the stitch-forming devices.

It will be understood that the two parts of the shaft F may be connected by two cranks i and a link, as is donewith the shaftA,in-F

stead of by the slide f and singlefcrank e, as

'hereinbefore described. In like manner the a crank e and slide f may, when :preferred, be.

substituted for the twocranks a and link 1B in connecting the two parts or sections of the shaft A. i

I would furthersay that, except in the com binations with portions of a sewing-machine,

as herein set forth, I do not, in this applicaQ tion,claim either of the two jnstwmentionedk devices for connecting the two .eccentricallyjarranged sections of a difl'erentiati[lg-shaft,

as I propose to claim the same new meansof; transmitting motion in separate and distinct applications for Letters Patent.

t l m s my invention is- 1. The rod D, pivoted at itsupper end to the extremity of the rocking arm. E, the link F, connecting the rod Dat or nearits centeu i to the crank c of the needleshaft F, and the primary shaft A, connected by itscrank G' with the lowerend of the rod l),yall combiuedj v s, in;

In ord 'ertopreventtheshuttle from jarring i for operation substantially as and for the purpose set forth.

2. In a rotary-shuttle machine, the raceway G, the shuttle D, constructed with springs u, adapted to bear against the sides of the raceway, and the revolving arm B, provided to give the rotary movement to the shuttle within the raceway and in unison with the needle b, the various parts being combined and arranged for united action, substantially as shown and specified.

3. The curved leaf-springs u, in combination with the traveling shuttle D and raceway G, substantially as and for the purpose set lar stem 1' and bobbin 8, the whole constructed and combined to permit the delivery of the thread at the rear end of the shuttle, substantially as and for the purpose set forth.

JOHN MGCLOSKEY.

Witnesses: WM. A. J. Tommy, H. WELLS, Jr. 

